| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 39 |
4%
|
| 1986 | 2 |
0.2%
|
|
| 1988 | 1 |
0.1%
|
|
| 1990 | 4 |
0.4%
|
|
| 1992 | 2 |
0.2%
|
|
| 1993 | 1 |
0.1%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 2 |
0.2%
|
|
| 1996 | 1 |
0.1%
|
|
| 1997 | 1 |
0.1%
|
|
| 1998 | 3 |
0.3%
|
|
| 1999 | 8 |
0.8%
|
|
| 2000 | 16 |
1.7%
|
|
| 2001 | 8 |
0.8%
|
|
| 2002 | 4 |
0.4%
|
|
| 2003 | 5 |
0.5%
|
|
| 2004 | 5 |
0.5%
|
|
| 2005 | 15 |
1.6%
|
|
| 2006 | 9 |
0.9%
|
|
| 2007 | 11 |
1.1%
|
|
| 2008 | 21 |
2.2%
|
|
| 2009 | 24 |
2.5%
|
|
| 2010 | 36 |
3.7%
|
|
| 2011 | 24 |
2.5%
|
|
| 2012 | 42 |
4.4%
|
|
| 2013 | 39 |
4%
|
|
| 2014 | 64 |
6.6%
|
|
| 2015 | 82 |
8.5%
|
|
| 2016 | 71 |
7.4%
|
|
| 2017 | 84 |
8.7%
|
|
| 2018 | 96 |
9.9%
|
|
| 2019 | 91 |
9.4%
|
|
| 2020 | 67 |
6.9%
|
|
| 2021 | 62 |
6.4%
|
|
| 2022 | 24 |
2.5%
|
|
| Sysmiss | 2810 |